>> couric: tonight, as allied forces pound targets in libya, the u.s. military insists qaddafi is not a target, but the commander in chief makes it clear... >> it is u.s. policy that qaddafi needs to go. >> couric: i'm katie couric. also tonight, another setback in japan. workers again forced to evacuate as smoke pours from crippled nuclear reactors and concerns grow about the safety of japan's food supply. and another a.t.f. agent tells cbs news the agency encouraged gun dealers in this country to sell weapons to mexican drug cartels. captioning sponsored by cbs from cbs news world headquarters in new york, this is the "cbs evening news" with katie couric. >> couric: good evening, everyone. for a third straight night, tripoli has come under attack from u.s. and allied forces as they establish a no-fly zone over libya. anti-aircraft fire lit up the sky as moammar qaddafi's army tried to defend against the attack. rebelss solidified their control in benghazi and launch and offensive to retake other cities. president obama said today the u.s. will turn over leadership of the oper

in benghazi and launch and offensive to retake other cities. president obama said today the u.s. will turn over leadership of the operation to other nations within days. the president and british prime minister david cameron said qaddafi must go though they insisted he is not a target of the attacks. but a cruise missile attack last night may have been too close for comfort for the libyan dictator. mark phillips is in tripoli. >> reporter: of all the targets that have been hit in these attacks, this flattened building in the qaddafi compound in tripoli is the one the qaddafi loyalists have complained about most. this is the attack they claim was launched to kill him. despite the hundreds of people who have gathered or been gathered around the complex to provide protection. >> families, children, men and women have come from everywhere to stay day and night to protect this location, to protect this location and the rocket hits only 52 to 100 meters away from them. >> reporter: qaddafi himself was probably not in his tent. he hasn't been seen since before the bombing began. his location a se

ruled yemen for 32 years. he is a key u.s. ally in the fight against al qaeda. meanwhile, president obama plans to speak to the nation monday night about libya to explain why he ordered u.s. military action and give an update on the operation. today french and british jets struck libyan artillery and tanks near ajdabiya. smoke could be seen miles away. late today, rebels began a new push to retake the city. and libyan state television showed damage from overnight air strikes in tripoli. nato, which is taking over control of enforcing the no-fly zone, said it's planning for a mission that would last three months. as other nations play a larger role, the u.s. is publicly taking a step back, but it's a small step. more on that from david martin at the pentagon. >> reporter: this is what the battle for libya looks like to a pilot. it's a british pilot attacking a libyan tank. but more than half the 96 strike missions in the past 24 hours were american. and so were all 16 of the tomahawk cruise missiles fired overnight. despite the announcement that nato would soon be taking command of t

that could cost him his job. a federal agent tells cbs news he was ordered to let guns from the u.s. make their way to mexican drug cartels. i'm katie couric. also tonight, president obama's message to qaddafi. >> the violence must stop. moammar qaddafi has lost the legitimacy to lead and he must leave. >> couric: with the threat of a lockout hanging over the players n.f.l. contract talks go into overtime. and sea otters under attack from sharks and something more mysterious. captioning sponsored by cbs from cbs news world headquarters in new york, this is the "cbs evening news" with katie couric. >> couric: good evening, everyone. they are two presidents leading a war against a common enemy: mexican drug cartels. president obama welcomed mexico's president felipe calderon to the white house today and mr. obama said the two countries are making progress against drug gangs. >> to combat the southbound flow of guns and money we are screening all southbound rail cargo, seizing many more guns bound for mexico and we are putting more gunrunners behind bars. >> couric: but one of the men on the

the tactic letting guns walk. in this case into the hands of criminals who would use them in mexico and the u.s. doddson's bosses say that never happened. now he's risking his job to go public. >> i'm boots on the ground here in phoenix and telling you we've been doing it everyday since i've been here. here i am. tell me i didn't do the things that i did. tell me you didn't order me to do the things i did. tell me it didn't happen. now you have a name on it, you have a face to put with it. here i am. someone. now tell me it didn't happen. >> reporter: agent doddson and other insiders say the gun-walking strategy was approved all the way to the justice department. the idea was to see where the guns ended up, build a big case and take down a major cartel and it was all kept secret from mexico. a.t.f. named the case "fast and furious." this surveillance video obtained by cbs news shows suspected drug cartel suppliers carrying boxes of weapons to their cars at a phoenix gun shop. those long boxes being loaded into the red car are a.k.-47 type assault rifles. >> reporter: so it turns out a.t.f. not

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